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Long-Term Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2014
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Federal home loan bank stock     $ 34,437,000 $ 10,688,000
Accrued interest payable     2,000,000 2,000,000
Accrued interest payable (less than) [1]     8,936,000 $ 8,503,000
Secured borrowings        
Debt Instrument [Line Items]        
Commercial mortgage loans     $ 63,000,000  
Convertible notes | Exchangeable senior notes due 2019        
Debt Instrument [Line Items]        
Convertible notes $ 205,000,000      
Debt instrument interest rate 5.625%      
Debt Instrument Maturity Year 2019      
Debt Instrument Redemption Date Nov. 15, 2019      
Net proceeds from issuance of convertible debt $ 198,000,000      
Interest expense yield     6.59%  
Accrued interest payable     $ 2,000,000  
Unamortized deferred issuance costs     $ 5,000,000  
Convertible debt, conversion ratio     0.0461798  
Convertible senior notes conversion per share     $ 21.65  
Convertible notes | Convertible senior notes due 2018        
Debt Instrument [Line Items]        
Convertible notes   $ 288,000,000    
Debt instrument interest rate   4.625%    
Net proceeds from issuance of convertible debt   $ 279,000,000    
Interest expense yield     5.42%  
Accrued interest payable     $ 3,000,000  
Unamortized deferred issuance costs     $ 4,000,000  
Convertible debt, conversion ratio     0.041132  
Convertible senior notes conversion per share     $ 24.31  
Trust Preferred Securities        
Debt Instrument [Line Items]        
Interest expense yield     2.62% 2.58%
Debt instrument face amount     $ 100,000,000  
Interest expense yield on trust preferred securities and subordinated notes     6.87% 6.88%
Accrued interest payable (less than)     $ 1,000,000 $ 1,000,000
Subordinated Notes        
Debt Instrument [Line Items]        
Interest expense yield     2.62% 2.58%
Debt instrument face amount     $ 40,000,000  
Interest expense yield on trust preferred securities and subordinated notes     6.87% 6.88%
Accrued interest payable (less than)     $ 1,000,000 $ 1,000,000
Residential Loans        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 1,400,000,000 1,550,000,000
FHLB Chicago        
Debt Instrument [Line Items]        
Interest rate margin reset period     91 days  
FHLB Chicago | Residential Loans        
Debt Instrument [Line Items]        
Residential mortgage loans securing FHLB advances     $ 1,680,000,000  
Subsidiaries | FHLB Chicago        
Debt Instrument [Line Items]        
Maximum borrowing capacity     2,000,000,000  
Additional borrowings from FHLB     985,000,000  
Outstanding FHLB advances     1,480,000,000 $ 496,000,000
FHLB advances, long-term     $ 1,340,000,000  
Weighted average interest rate     0.46%  
Weighted average maturity     9 years  
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At December 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,195,574 and $1,900,208, respectively. At December 31, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,050,861 and $1,546,490, respectively. See Note 4 for further discussion.